Conjugates of erythropoietin (pep) with polyethylene glycol...

C - Chemistry – Metallurgy – 07 – K

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Details

C07K 17/02 (2006.01) A61K 38/18 (2006.01) A61K 47/48 (2006.01) A61P 7/06 (2006.01) C07K 14/505 (2006.01)

Patent

CA 2431964

The present invention refers to conjugates of erythropoietin with poly(ethylene glycol) comprising an erythropoietin glycoprotein having an N- terminal .alpha.-amino group and having the in vivo biological activity of causing bone marrow cells to increase production of reticulocytes and red blood cells and selected from the group consisting of human erythropoietin and analogs thereof which have sequence of human erythropoietin modified by the addition of from 1 to 6 glycosylation sites or a rearrangement of at least one glycosylation site; said glycoprotein being covalently linked to one poly(ethylene glycol) group of the formula -CO-(CH2)x-(OCH2CH2)m-OR with the - CO of the poly(ethylene glycol) group forming an amide bond with said N- terminal .alpha.-amino group; wherein R is lower alkyl; x is 2 or 3; and m is from about 450 to about 1350.

L'invention concerne des conjugués d'érythropoïétine et de poly(éthylène glycol) comprenant une glycoprotéine d'érythropoïétine, laquelle comporte un groupe .alpha.-amino N terminal, possède l'activité biologique <i>in vivo</i> provoquant l'accroissement de la production, par les cellules de la moelle osseuse, des réticulocytes et globules rouges, et est choisie dans le groupe constitué par l'érythropoïétine humaine et des analogues de celle-ci comprenant une séquence d'érythropoïétine humaine modifiée par l'ajout d'un à six sites de glycosylation, ou par réarrangement d'au moins un site de glycosylation. Cette glycoprotéine est liée de manière covalente à un groupe poly(éthylèneglycol) possédant la formule -CO-(CH¿2?)¿x?-(OCH¿2?CH¿2?)¿m?-OR, dans laquelle le -CO du groupe poly(éthylène glycol) forme une liaison amide avec ledit groupe .alpha.-amino N terminal, R représente alkyle inférieur, x vaut 2 ou 3 et m est compris entre environ 450 et environ 1350.

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